/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.tsfile.utils;

import org.apache.iotdb.tsfile.common.conf.TSFileConfig;
import org.apache.iotdb.tsfile.common.conf.TSFileDescriptor;
import org.apache.iotdb.tsfile.exception.write.WriteProcessException;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.file.metadata.enums.TSEncoding;
import org.apache.iotdb.tsfile.read.common.Path;
import org.apache.iotdb.tsfile.write.TsFileWriter;
import org.apache.iotdb.tsfile.write.record.TSRecord;
import org.apache.iotdb.tsfile.write.schema.MeasurementSchema;
import org.apache.iotdb.tsfile.write.schema.Schema;
import org.junit.Assert;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class FileGenerator {

    private static final Logger LOG = LoggerFactory.getLogger(FileGenerator.class);
    public static String outputDataFile =
            TsFileGeneratorForTest.getTestTsFilePath("root.sg1", 0, 0, 0);
    public static Schema schema;
    private static int ROW_COUNT = 1000;
    private static TsFileWriter innerWriter;
    private static String inputDataFile;
    private static String errorOutputDataFile;
    private static final TSFileConfig config = TSFileDescriptor.getInstance().getConfig();

    public static void generateFile(int rowCount, int maxNumberOfPointsInPage) throws IOException {
        ROW_COUNT = rowCount;
        int oldMaxNumberOfPointsInPage = config.getMaxNumberOfPointsInPage();
        config.setMaxNumberOfPointsInPage(maxNumberOfPointsInPage);

        prepare();
        write();
        config.setMaxNumberOfPointsInPage(oldMaxNumberOfPointsInPage);
    }

    public static void generateFile(int rowCount, int maxNumberOfPointsInPage, String filePath)
            throws IOException {
        ROW_COUNT = rowCount;
        int oldMaxNumberOfPointsInPage = config.getMaxNumberOfPointsInPage();
        config.setMaxNumberOfPointsInPage(maxNumberOfPointsInPage);

        prepare();
        write(filePath);
        config.setMaxNumberOfPointsInPage(oldMaxNumberOfPointsInPage);
    }

    public static void generateFile(int maxNumberOfPointsInPage, int deviceNum, int measurementNum)
            throws IOException {
        ROW_COUNT = 1;
        int oldMaxNumberOfPointsInPage = config.getMaxNumberOfPointsInPage();
        config.setMaxNumberOfPointsInPage(maxNumberOfPointsInPage);

        prepare(deviceNum, measurementNum);
        write();
        config.setMaxNumberOfPointsInPage(oldMaxNumberOfPointsInPage);
    }

    public static void generateFile() throws IOException {
        generateFile(1000, 10);
    }

    public static void prepare() throws IOException {
        File file = new File(outputDataFile);
        if (!file.getParentFile().exists()) {
            Assert.assertTrue(file.getParentFile().mkdirs());
        }
        inputDataFile = TsFileGeneratorForTest.getTestTsFilePath("root.sg1", 0, 0, 1);
        file = new File(inputDataFile);
        if (!file.getParentFile().exists()) {
            Assert.assertTrue(file.getParentFile().mkdirs());
        }
        errorOutputDataFile = TsFileGeneratorForTest.getTestTsFilePath("root.sg1", 0, 0, 2);
        file = new File(errorOutputDataFile);
        if (!file.getParentFile().exists()) {
            Assert.assertTrue(file.getParentFile().mkdirs());
        }
        generateTestSchema();
        generateSampleInputDataFile();
    }

    public static void prepare(int deviceNum, int measurementNum) throws IOException {
        File file = new File(outputDataFile);
        if (!file.getParentFile().exists()) {
            Assert.assertTrue(file.getParentFile().mkdirs());
        }
        inputDataFile = TsFileGeneratorForTest.getTestTsFilePath("root.sg1", 0, 0, 1);
        file = new File(inputDataFile);
        if (!file.getParentFile().exists()) {
            Assert.assertTrue(file.getParentFile().mkdirs());
        }
        errorOutputDataFile = TsFileGeneratorForTest.getTestTsFilePath("root.sg1", 0, 0, 2);
        file = new File(errorOutputDataFile);
        if (!file.getParentFile().exists()) {
            Assert.assertTrue(file.getParentFile().mkdirs());
        }
        generateTestSchema(deviceNum, measurementNum);
        generateSampleInputDataFile(deviceNum, measurementNum);
    }

    public static void after() {
        after(outputDataFile);
    }

    public static void after(String filePath) {
        File file = new File(inputDataFile);
        if (file.exists()) {
            file.delete();
        }
        file = new File(filePath);
        if (file.exists()) {
            file.delete();
        }
        file = new File(errorOutputDataFile);
        if (file.exists()) {
            file.delete();
        }
    }

    private static void generateSampleInputDataFile() throws IOException {
        File file = new File(inputDataFile);
        if (file.exists()) {
            file.delete();
        }
        file.getParentFile().mkdirs();
        FileWriter fw = new FileWriter(file);

        long startTime = 1480562618000L;
        startTime = startTime - startTime % 1000;
        for (int i = 0; i < ROW_COUNT; i++) {
            // write d1
            String d1 = "d1," + (startTime + i) + ",s1," + (i * 10 + 1) + ",s2," + (i * 10 + 2);
            if (i % 20 < 10) {
                // LOG.info("write null to d1:" + (startTime + i));
                d1 = "d1," + (startTime + i) + ",s1,,s2," + (i * 10 + 2);
            }
            if (i % 5 == 0) {
                d1 += ",s3," + (i * 10 + 3);
            }
            if (i % 8 == 0) {
                d1 += ",s4," + "dog" + i;
            }
            if (i % 9 == 0) {
                d1 += ",s5," + "false";
            }
            if (i % 10 == 0) {
                d1 += ",s6," + ((int) (i / 9.0) * 100) / 100.0;
            }
            if (i % 11 == 0) {
                d1 += ",s7," + ((int) (i / 10.0) * 100) / 100.0;
            }
            fw.write(d1 + "\r\n");

            // write d2
            String d2 = "d2," + (startTime + i) + ",s2," + (i * 10 + 2) + ",s3," + (i * 10 + 3);
            if (i % 20 < 5) {
                // LOG.info("write null to d2:" + (startTime + i));
                d2 = "d2," + (startTime + i) + ",s2,,s3," + (i * 10 + 3);
            }
            if (i % 5 == 0) {
                d2 += ",s1," + (i * 10 + 1);
            }
            if (i % 8 == 0) {
                d2 += ",s4," + "dog" + i % 4;
            }
            fw.write(d2 + "\r\n");
        }
        // write error
        String d =
                "d2,3,"
                        + (startTime + ROW_COUNT)
                        + ",s2,"
                        + (ROW_COUNT * 10 + 2)
                        + ",s3,"
                        + (ROW_COUNT * 10 + 3);
        fw.write(d + "\r\n");
        d = "d2," + (startTime + ROW_COUNT + 1) + ",2,s-1," + (ROW_COUNT * 10 + 2);
        fw.write(d + "\r\n");
        fw.close();
    }

    private static void generateSampleInputDataFile(int deviceNum, int measurementNum)
            throws IOException {
        File file = new File(inputDataFile);
        if (file.exists()) {
            Files.delete(file.toPath());
        }
        if (!file.getParentFile().mkdirs()) {
            LOG.info("Failed to create file folder {}", file.getParentFile());
        }
        FileWriter fw = new FileWriter(file);

        long startTime = 1480562618000L;
        for (int i = 0; i < deviceNum; i++) {
            for (int j = 0; j < measurementNum; j++) {
                String d =
                        "d"
                                + generateIndexString(i, deviceNum)
                                + ","
                                + startTime
                                + ",s"
                                + generateIndexString(j, measurementNum)
                                + ","
                                + 1;
                fw.write(d + "\r\n");
            }
        }
        fw.close();
    }

    public static void write() throws IOException {
        write(outputDataFile);
    }

    public static void write(String filePath) throws IOException {
        File file = new File(filePath);
        File errorFile = new File(errorOutputDataFile);
        if (file.exists()) {
            file.delete();
        }
        if (errorFile.exists()) {
            errorFile.delete();
        }

        innerWriter = new TsFileWriter(file, schema, config);

        // write
        try {
            writeToTsFile(schema);
        } catch (WriteProcessException e) {
            e.printStackTrace();
        }
        LOG.info("write to file successfully!!");
    }

    private static void generateTestSchema() {
        schema = new Schema();
        List<MeasurementSchema> schemaList = new ArrayList<>();
        schemaList.add(
                new MeasurementSchema(
                        "s1", TSDataType.INT32, TSEncoding.valueOf(config.getValueEncoder())));
        schemaList.add(
                new MeasurementSchema(
                        "s2", TSDataType.INT64, TSEncoding.valueOf(config.getValueEncoder())));
        schemaList.add(
                new MeasurementSchema(
                        "s3", TSDataType.INT64, TSEncoding.valueOf(config.getValueEncoder())));
        schemaList.add(new MeasurementSchema("s4", TSDataType.TEXT, TSEncoding.PLAIN));
        schemaList.add(new MeasurementSchema("s5", TSDataType.BOOLEAN, TSEncoding.PLAIN));
        schemaList.add(new MeasurementSchema("s6", TSDataType.FLOAT, TSEncoding.RLE));
        schemaList.add(new MeasurementSchema("s7", TSDataType.DOUBLE, TSEncoding.RLE));
        MeasurementGroup measurementGroup = new MeasurementGroup(false, schemaList);
        schema.registerMeasurementGroup(new Path("d1"), measurementGroup);

        schemaList.clear();
        schemaList.add(
                new MeasurementSchema(
                        "s1", TSDataType.INT32, TSEncoding.valueOf(config.getValueEncoder())));
        schemaList.add(
                new MeasurementSchema(
                        "s2", TSDataType.INT64, TSEncoding.valueOf(config.getValueEncoder())));
        schemaList.add(
                new MeasurementSchema(
                        "s3", TSDataType.INT64, TSEncoding.valueOf(config.getValueEncoder())));
        schemaList.add(new MeasurementSchema("s4", TSDataType.TEXT, TSEncoding.PLAIN));
        measurementGroup = new MeasurementGroup(false, schemaList);
        schema.registerMeasurementGroup(new Path("d2"), measurementGroup);
    }

    private static void generateTestSchema(int deviceNum, int measurementNum) {
        schema = new Schema();
        for (int i = 0; i < deviceNum; i++) {
            for (int j = 0; j < measurementNum; j++) {
                schema.registerTimeseries(
                        new Path("d" + generateIndexString(i, deviceNum)),
                        new MeasurementSchema(
                                "s" + generateIndexString(j, measurementNum),
                                TSDataType.INT32,
                                TSEncoding.valueOf(config.getValueEncoder())));
            }
        }
    }

    private static void writeToTsFile(Schema schema) throws IOException, WriteProcessException {
        Scanner in = getDataFile(inputDataFile);
        long lineCount = 0;
        long startTime = System.currentTimeMillis();
        long endTime = System.currentTimeMillis();
        assert in != null;
        while (in.hasNextLine()) {
            if (lineCount % 1000000 == 0) {
                LOG.info("write line:{},use time:{}s", lineCount, (endTime - startTime) / 1000);
            }
            String str = in.nextLine();
            TSRecord record = RecordUtils.parseSimpleTupleRecord(str, schema);
            innerWriter.write(record);
            lineCount++;
        }
        endTime = System.currentTimeMillis();
        LOG.info("write line:{},use time:{}s", lineCount, (endTime - startTime) / 1000);
        innerWriter.close();
        in.close();
    }

    private static Scanner getDataFile(String path) {
        File file = new File(path);
        try {
            return new Scanner(file);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * generate curIndex string, use "0" on left to make sure align
     *
     * @param curIndex current index
     * @param maxIndex max index
     * @return curIndex's string
     */
    public static String generateIndexString(int curIndex, int maxIndex) {
        StringBuilder res = new StringBuilder(String.valueOf(curIndex));
        String target = String.valueOf(maxIndex);
        while (res.length() < target.length()) {
            res.insert(0, "0");
        }
        return res.toString();
    }
}
